CN210617396U

CN210617396U - Mould for preparing graphite bipolar plate

Info

Publication number: CN210617396U
Application number: CN201921070558.1U
Authority: CN
Inventors: 郑泽民; 吴昊; 项福军
Original assignee: Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry Corp No 712 Institute CSIC
Current assignee: Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry Corp No 712 Institute CSIC
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2020-05-26
Anticipated expiration: 2029-07-09

Abstract

The utility model provides a mould for preparing graphite bipolar plate, including the last mould and the lower mould of mutually supporting, it includes framed upper and last mould core to go up the mould, the lower extreme of framed upper is formed with the upper mounting groove, the bottom surface both ends of upper mounting groove are formed with the last pore-forming post, be formed with the upper mounting hole with last pore-forming post complex on the last mould core, it installs the elastic component in the upper mounting groove and between the up end of framed upper and the bottom surface of upper mounting groove to go up the mould core, the lower mould includes framed lower mould and lower mould core, the upper end of framed lower is formed with lower mounting groove, the bottom surface of lower mounting groove corresponds the pore-forming post and becomes to have lower pore-forming post, be formed with the lower mounting hole with lower pore-forming post complex on the lower mould core, the lower; the bottom surface of the lower mounting groove is provided with at least one through hole penetrating through the lower die frame, and the die combines the flow channel forming and punching processes of the graphite bipolar plate together, so that one-step forming and punching are realized, the production cost is saved, the production efficiency is improved, and the process flow is simplified.

Description

Mould for preparing graphite bipolar plate

Technical Field

The utility model relates to a technique graphite bipolar plate technical field, concretely relates to preparation graphite bipolar plate's mould.

Background

The bipolar plate is an important component of the proton exchange membrane fuel cell and plays a role in supporting the fuel cell and providing a reaction gas channel and a coolant channel. As for the use conditions of the bipolar plate itself, the bipolar plate itself needs to have not only higher conductivity, corrosion resistance, gas permeation resistance, etc., but also characteristics of low material cost, easy processing, good dimensional stability, etc.

The common materials of the proton exchange membrane fuel cell polar plate include a graphite plate, a metal plate, a composite plate and the like, wherein the graphite plate is divided into hard graphite and flexible graphite, and the flexible graphite can be molded in a stamping mode to realize batch production, so the flexible graphite plate is mostly adopted as the material of the fuel cell bipolar plate in industrial production.

In the continuous production of the flexible graphite bipolar plate, the main procedures comprise infiltration, die pressing and the like, the procedures of the prior flexible graphite bipolar plate die pressing scheme, such as flow channel forming, edge cutting, punching and the like, are mutually independent, the flow channel forming, punching and edge cutting of the bipolar plate are divided into three procedures, the process complexity is high, the production cost is high, and the large-scale popularization and use are not facilitated.

SUMMERY OF THE UTILITY MODEL

The utility model provides a graphite bipolar plate mould to the technology is complicated when solving graphite bipolar plate production among the prior art, technical problem with high costs.

The utility model provides a scheme as follows of above-mentioned technical problem: a mold for preparing a graphite bipolar plate comprises an upper mold and a lower mold which are matched with each other, wherein the upper mold comprises an upper mold frame and an upper mold core, an upper mounting groove is formed at the lower end of the upper mold frame, upper hole forming columns are formed at two ends of the bottom surface of the upper mounting groove, upper mounting holes matched with the upper hole forming columns are formed in the upper mold core, the upper mold core is mounted in the upper mounting groove, an elastic piece is mounted between the upper end surface of the upper mold core and the bottom surface of the upper mounting groove, when the elastic piece is not extruded, the lower end surface of the upper mold core and the lower end surface of the upper hole forming columns are positioned on the same horizontal plane, the lower mold comprises a lower mold frame and a lower mold core, a lower mounting groove is formed at the upper end of the lower mold frame, a lower hole forming column is formed on the bottom surface of the lower mounting groove corresponding to the upper hole forming columns, and a lower mounting hole matched with the lower, the lower die core is arranged in the lower mounting groove; the bottom surface of the lower mounting groove is provided with at least one through hole penetrating through the lower die frame, a push rod capable of moving up and down along the through hole is correspondingly arranged in the through hole, and the upper end of the push rod is abutted against the lower end of the lower die core; a cavity is formed between the upper mold core and the lower mold core, a first forming bulge is arranged on the lower end face of the upper mold core and used for forming an upper polar plate flow channel on the upper end face of the polar plate, and a second forming bulge is arranged on the upper end face of the lower mold core and used for forming a lower polar plate flow channel on the lower end face of the polar plate.

The utility model provides a preparation graphite bipolar plate's mould, can be in graphite bipolar plate's preparation in-process, realize the shaping of bipolar plate runner and punch a hole simultaneously, when graphite former board is placed in the die cavity, fixed upper die frame and lower die frame, promote the ejector pin upward movement, lower die core shifts up the mold core on the extrusion, first shaping arch and second shaping arch form runner and polar plate lower runner on the polar plate respectively on graphite former board's up end and terminal surface down, go up the pore-forming post simultaneously and cut out steam business turn over hole with the cooperation of pore-forming post down on graphite former board, this mould is in the same place graphite bipolar plate's runner shaping and the technology combination that punches a hole, and is easy and simple to handle, and the production cost is saved, and the production efficiency is improved, and the process flow is simplified.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic perspective view of a mold for manufacturing a graphite bipolar plate according to the present invention;

fig. 2 is an exploded view of a mold for manufacturing a graphite bipolar plate according to the present invention;

FIG. 3 is a schematic diagram of an exploded structure from another perspective relative to FIG. 2;

fig. 4 is a schematic structural view of the mold for preparing the graphite bipolar plate of the present invention before mold assembly;

fig. 5 is a schematic structural diagram of the mold for preparing the graphite bipolar plate according to the present invention after mold assembly.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

As shown in fig. 1 to 3, the present invention provides a mold for preparing a graphite bipolar plate, which comprises an upper mold 1 and a lower mold 2 that are matched with each other.

Wherein, it includes last framed 11 and last mould core 12 to go up mould 1, the lower extreme of going up framed 11 is formed with mounting groove 111, the bottom surface both ends of going up mounting groove 111 are formed with last pore-forming post 112, go up be formed with on the mould core 12 with go up pore-forming post 112 complex and go up mounting hole 121, go up mould core 12 install in go up mounting groove 111 just go up the up end of mould core 12 with install elastic component 13 between the bottom surface of going up mounting groove 111, when elastic component 13 did not receive the extrusion, go up the lower terminal surface of mould core 12 with the lower terminal surface of going up pore-forming post 112 is located same horizontal plane.

Preferably, in this embodiment, the elastic element is a spring, and it is understood that in other embodiments, the elastic element may also be an elastic sheet or an elastic pad or other objects capable of pressing to generate elastic deformation.

Lower mould 2 includes lower mould frame 21 and lower mold core 22, the upper end of lower mould frame 21 is formed with lower mounting groove 211, the bottom surface of lower mounting groove 211 corresponds go up pore-forming post 112 and be formed with down pore-forming post 212, be formed with on the lower mold core 22 with lower mounting hole 221 of pore-forming post 212 complex down, lower mold core 22 install in mounting groove 211 down.

In this embodiment, the figure of going up pore-forming post and lower pore-forming post is six, and forms in the mounting groove that corresponds with the mode of the three equipartition of one end, and it can be understood that the concrete number of going up pore-forming post and lower pore-forming post can be formulated according to the demand of graphite polar plate, and the change of the figure of pore-forming post does not surpass the utility model discloses a protection scope.

At least one through hole 213 penetrating through the lower mold frame is formed in the bottom surface of the lower mounting groove 211, a push rod 23 capable of moving up and down along the through hole 213 is correspondingly arranged in the through hole 213, and the upper end of the push rod 23 is abutted against the lower end of the lower mold core 22; a cavity is formed between the upper mold core 12 and the lower mold core 22, a first forming protrusion 122 is arranged on the lower end surface of the upper mold core 12 and used for forming an upper pole plate flow channel on the upper end surface of the pole plate, and a second forming protrusion 222 is arranged on the upper end surface of the lower mold core 22 and used for forming a lower pole plate flow channel on the lower end surface of the pole plate.

In order to facilitate the pore-forming of the upper pore-forming column 112 on the graphite original plate, a shear angle of 75-90 degrees is formed on the edge of the lower end surface of the upper pore-forming column 112.

In order to realize that the edge of the molded graphite double-click plate is a right angle, the side surface and the bottom surface of the upper mounting groove 111 are perpendicular to each other, and the bottom surface and the side surface of the lower mounting groove 211 are perpendicular to each other.

Further, in the prior art, the edge cutting of the graphite bipolar plate generally adopts an extrusion cutting mode, the edge of the plate is a sharp corner, the overall dimension cannot be completely consistent, so that the plate cannot be assembled by adopting external positioning, and adverse effects are brought to the design of the bipolar plate, the assembly of a galvanic pile and the like, in order to solve the technical problem, the depth of the upper mounting groove 111 is smaller than the height of the upper hole forming column 112, and the depth of the lower mounting groove 211 is larger than the sum of the height of the lower hole forming column 212 and the thickness of the formed plate 40, so as to ensure that the graphite plate deforms inside the lower mold frame 21; the edge of the polar plate is right-angled, and the subsequent galvanic pile assembly process can adopt an external positioning mode for positioning; the sum of the depth of the upper mounting groove 111 and the depth of the lower mounting groove 211 is smaller than the sum of the heights of the upper pore-forming column 112 and the lower pore-forming column 212, and a gap is reserved between the upper mold frame 11 and the lower mold frame 21 after mold closing, so that the consistency of the appearance of the formed polar plate is ensured.

For the convenience of understanding, the utility model is described in detail below.

Before the mold is closed, as shown in fig. 4, the graphite original plate 30 is placed in the lower mold frame 21 and positioned at the upper end of the lower hole-forming column 212, and the height of the lower mold core 22 is adjusted by using the ejector 23, so that the upper end surface of the lower mold core 22 and the upper end surface of the lower hole-forming column 212 are positioned on the same horizontal plane, at this time, the elastic member 13 is not extruded, and the lower end surface of the upper mold core 12 and the lower end surface of the upper hole-forming column 112 are also positioned on the same horizontal plane.

When the die is closed, the upper die frame 11 is covered on the lower die frame 21, the graphite original plate is positioned in a cavity between the upper die core 12 and the lower die core 22, the upper die frame 11 and the lower die frame 21 are fixed at the moment, the ejector rod 23 is pushed to move upwards, and the lower die core 22 moves upwards to extrude the upper die core 12.

After the mold is closed, as shown in fig. 5, the first forming protrusion 122 and the second forming protrusion 222 form an upper pole plate flow channel and a lower pole plate flow channel on the upper end surface and the lower end surface of the graphite original plate 30, respectively, so as to form the formed pole plate 40, and at the same time, because the upper hole-forming column 112 and the lower hole-forming column 212 are fixed, the upper hole-forming column 112 and the lower mold core 22 are matched with each other to cut out water vapor inlet and outlet holes on the forming machine plate 40, and the waste material 31 remains between the upper hole-forming column 112 and the lower hole-forming.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the present invention can be smoothly implemented by those skilled in the art according to the drawings and the above description; however, those skilled in the art should understand that changes, modifications and variations made by the above-described technology can be made without departing from the scope of the present invention, and all such changes, modifications and variations are equivalent embodiments of the present invention; meanwhile, any changes, modifications, evolutions, etc. of the above embodiments, which are equivalent to the actual techniques of the present invention, still belong to the protection scope of the technical solution of the present invention.

Claims

1. A mold for preparing a graphite bipolar plate is characterized by comprising an upper mold and a lower mold which are matched with each other, wherein the upper mold comprises an upper mold frame and an upper mold core, an upper mounting groove is formed at the lower end of the upper mold frame, upper hole forming columns are formed at two ends of the bottom surface of the upper mounting groove, upper mounting holes matched with the upper hole forming columns are formed in the upper mold core, the upper mold core is mounted in the upper mounting groove, an elastic piece is mounted between the upper end surface of the upper mold core and the bottom surface of the upper mounting groove, when the elastic piece is not extruded, the lower end surface of the upper mold core and the lower end surface of the upper hole forming columns are positioned on the same horizontal plane, the lower mold comprises a lower mold frame and a lower mold core, a lower mounting groove is formed at the upper end of the lower mold frame, a lower hole forming column is formed on the bottom surface of a lower hole forming corresponding to the upper hole forming column, a lower mounting hole matched with the lower hole forming, the lower die core is arranged in the lower mounting groove; the bottom surface of the lower mounting groove is provided with at least one through hole penetrating through the lower die frame, a push rod capable of moving up and down along the through hole is correspondingly arranged in the through hole, and the upper end of the push rod is abutted against the lower end of the lower die core; a cavity is formed between the upper mold core and the lower mold core, a first forming bulge is arranged on the lower end face of the upper mold core and used for forming an upper polar plate flow channel on the upper end face of the polar plate, and a second forming bulge is arranged on the upper end face of the lower mold core and used for forming a lower polar plate flow channel on the lower end face of the polar plate.

2. The mold for manufacturing a graphite bipolar plate as claimed in claim 1, wherein the lower end surface edge of the upper holed column is formed with a shear angle of 75 ° to 90 °.

3. The mold for manufacturing a graphite bipolar plate as claimed in claim 1, wherein the side surfaces of the upper mounting grooves are perpendicular to each other, and the bottom surfaces of the lower mounting grooves are perpendicular to each other.

4. The mold for manufacturing a graphite bipolar plate as claimed in claim 1, wherein the depth of the upper mounting groove is less than the height of the upper hole-forming column, the depth of the lower mounting groove is greater than the sum of the height of the lower hole-forming column and the thickness of the molding plate, and the sum of the depth of the upper mounting groove and the depth of the lower mounting groove is less than the sum of the heights of the upper hole-forming column and the lower hole-forming column.